Waltham 18 Size 7 Jewel Pocket Watch

Waltham, 18 Size, Open Face, Pendant Set Gilt, 7 Jewel, Model 1883, with Roman Dial in yellow gold fill, Philadelphia Watch Case Co. Case.
Waltham, of Waltham Massachusetts was the second largest company and was the first to produce watches from interchangeable parts on an assembly line. It was one of the first two companies to produce in quantity by the beginning of the American Civil War.